Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1995, Page 102

Náttúrufræðingurinn - 1995, Page 102
range size, brood movements and habitat se- lection. Ornis Scandinavica 16. 181-190. Ferguson, R.S. 1991. Detection and classifica- tion of Muskox habitat on Banks Island, Northwest Territories, Canada, using Land- sat Thematic Mapper data. Arctic 44, Supp. 1. 66-74. Finnur Guðmundsson 1960. Some reflections on ptarmigan cycles in Iceland. Proceedings of the Xllth International Ornithological Congress, Helsinki 1958. 259-265. Hill, M.O. 1979a. DECORANA - a fortran pro- gram for detrended correspondence analysis and reciprocal averaging. Section of ecology and systematics, Comell University, Ithaca, New York. 52 bls. Hill, M.O. 1979b. TWINSPAN - a fortran pro- gram for arranging multivariate data in an ordered two-way table by classification of the individuals and attributes. Section of ecology and systematics, Cornell Univer- sity, Ithaca, New York. 90 bls. Hudson, P.J. 1986. Red Grouse: the biology and management of a wild gamebird. The Game Conservancy Trust, Fordinbridge. Hörður Kristinsson 1986. Plöntuhandbókin. Örn og Örlygur, Reykjavík. 304 bls. Hörður Kristinsson & Helgi Hallgrímsson 1991. Gróður í Mývatnssveit. í Náttúra Mý- vatns (ritstj. Arnþór Garðarsson & Arni Ein- arsson). Hið íslenska náttúrufræðifélag. Bls. 237-255. Jenkins, D., A. Watson & G.R. Miller 1967. Population fluctuations in the Red Grouse Lagopus lagopus scoticus. Journal of Ani- mal Ecology 36. 97-122. Laake, J.L., S.T. Buckland, D.R. Anderson & K.P. Bumham 1991. Distance sampling: abundance estimation of biological populat- ions, distance user guide. Fjölrit. 53 bls. Miller, G.R., D. Jenkins & A. Watson 1966. Heather performance and Red Grouse populations. I. Visual estimates of heather performance. Journal of Applied Ecology 3. 313-326. Miller, G.R., A. Watson & D. Jenkins 1970. Responses of Red Grouse populations to ex- perimental improvement of their food. I Animal populations in relation to their food resources (ritstj. A. Watson). Blackwell Sci- entific Publication, Oxford. Symposia of the British Ecological Society 10. 323-334. Ólafur K. Nielsen 1995. Rjúpnatalningar á Norðausturlandi 1981-1994. Náttúrufræð- ingurinn 65. árg, til birtingar. Palmeirim, J.M. 1988. Automatic mapping of avian species habitat using satellite im- agery. Oikos 52. 59-68. Pearce, C.M. 1991. Mapping Muskox habitat in the Canadian High Arctic with SPOT sat- ellite data. Arctic 44, Supp. 1. 49-57. Rands, M.R.W. 1986. The survival of game- bird (Galliformes) chicks in relation to pes- ticide use on cereals. Ibis 128. 57-64. Sokal, R.R. & F.J. Rohlf 1981. Biometry. W.H. Freeman & Co, San Francisco. 859 bls. Steindór Steindórsson 1964. Gróður á íslandi. Almenna bókafélagið, Reykjavík. 186 bls. Steindór Steindórsson 1974. Skrá um íslenzk gróðurhverfi. Rannsóknarstofnunin Neðri Ás, skýrsla 17. 1-23. Steindór Steindórsson 1980. Flokkun gróðurs í gróðurfélög. Islenskar Landbúnaðarrann- sóknir 12. 11-52. Timmermann, G. 1949. Die Vögel Islands. Vísindafélag fslendinga 28. 241-524. Wallin, D.O., C.C.H. Elliott, H.H. Shugart, C.J. Tucker & F. Wilhelmi 1992. Satellite remote sensing of breeding habitat for an African weaver-bird. Landscape Ecology 7. 87-99. ■ SUMMARY Rock Ptarmigan Density AND HEATHLAND VEGETATION in Suður-Þingeyjarsýsla, NE-Iceland The purpose of this paper is to analyse the re- lationship between breeding density of Rock Ptarmigan (Lagopus mutus) and different types of heathland vegetation. The study area was in NE-lceland (Fig. 1). This is an area of extensive rolling heathlands. The Icelandic ptarmigan population has a 10-year cycle (Finnur Guðmundsson 1960) and 1993, the study year, was a low year. Differences in spring density between high and low years on study plots in NE-Iceland have been c. 6-fold. Differences in spring density between differ- ent census plots within the same year have been c. 8-fold (Ólafur K. Nielsen 1995). The count point sites were placed in 7 main heathland areas so as to cover a gradient from the coast and 50 km inland. Within these areas a total of 42 count sites were chosen using a map (1:50.000) and a grid with points placed by using a random function. The only prereq- uisites were that the count sites should be 100
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Page 89
Page 90
Page 91
Page 92
Page 93
Page 94
Page 95
Page 96
Page 97
Page 98
Page 99
Page 100
Page 101
Page 102
Page 103
Page 104
Page 105
Page 106
Page 107
Page 108
Page 109
Page 110
Page 111
Page 112
Page 113
Page 114
Page 115
Page 116

x

Náttúrufræðingurinn

Direct Links

If you want to link to this newspaper/magazine, please use these links:

Link to this newspaper/magazine: Náttúrufræðingurinn
https://timarit.is/publication/337

Link to this issue:

Link to this page:

Link to this article:

Please do not link directly to images or PDFs on Timarit.is as such URLs may change without warning. Please use the URLs provided above for linking to the website.